if he has the uvmap in his alpha channel it's just an option in the diffusemap that turns everything brighter but the wireframe, so that would be my first bet :)
@jonas-144, that looks amaizing!!! Can i see the second uvmap channel of the wall mesh? i could never fix the problems i had with lighting on my modular wall pices
Quake despite its rather rudimentary and unoptimal uvmaps, it still holds up artistically, so much that every attempt to remake its art in a better technical form never did it justice
How does it make UVmapping harder? I personally find it to be much easier to unwrap intersecting pieces, than meshes that are completely watertight. Its just a click of a button and then you´re done.